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Lithium battery electrolyte

An electrolyte and lithium battery technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as battery swelling, improve cycle life and storage life, and reduce gas production.

Inactive Publication Date: 2021-06-18
QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The composition and concentration of the electrolyte have a great influence on the performance of the battery, especially the charge and discharge performance of the carbon negative electrode material has a great relationship with the solvent in the solution. If the solvent cannot form a dense SEI film on the surface of the carbon material, it will Continuously decompose and release gas on the surface of the carbon negative electrode, causing the battery to bulge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The lithium battery electrolyte of the present invention comprises 0.5 mol / L of lithium tetrafluoroborate, 0.3 mol / L of cyclic carbonate compounds, and 2 mol / L of vinylene carbonate.

[0020] The configuration process of the present invention is as follows:

[0021] 1. Put 300 grams of 4A molecular sieve into the drying equipment, and dry it for 3-4 hours at a temperature of 4-500 degrees Celsius, then place the molecular sieve in an environment with a relative humidity of less than 1%, cool and bottle it, and seal it with wax for storage ;

[0022] 2. Take three 2000ML small-mouth reagent bottles, fill them with lithium tetrafluoroborate, cyclic carbonate compounds and vinylene carbonate respectively, add 100 grams of molecular sieves to each bottle, seal with wax for storage, and shake once a day in the morning and evening. Until it drops below 20PPM;

[0023] 3. Mix lithium tetrafluoroborate, cyclic carbonate compound and vinylene carbonate mixed with 4A molecular ...

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PUM

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Abstract

The invention relates to the technical field of lithium batteries, in particular to a lithium battery electrolyte which comprises a lithium salt, an organic solvent, a functional additive and a film-forming additive. The film-forming additive is prepared from one or more of vinylene carbonate, vinylethylene carbonate, fluoroethylene carbonate, 1, 4-butanesultone, 1, 3-(1-propylene) sultone, ethylene sulfate and methylene methanedisulfonate; the molar concentration of the lithium salt is 0.1 mol / L-2 mol / L, the molar concentration of the organic solvent is 0-0.5 mol / L, and the molar concentration of the functional additive is 0.5-5 mol / L. The film-forming additive is added into the lithium battery electrolyte, so that the solvent can form a compact SEI film on the surface of the carbon material, the gas production rate of the lithium battery, especially the gas production rate at high temperature, can be greatly reduced, and the cycle life and the storage life of the lithium titanate battery can be prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery electrolyte. Background technique [0002] Lithium battery electrolyte is the carrier of ion transmission in the battery, generally composed of lithium salt and organic solvent. The electrolyte plays the role of conducting ions between the positive and negative electrodes of the lithium battery, which is the guarantee for the high voltage and high specific energy of the lithium ion battery. The electrolyte is generally prepared from high-purity organic solvents, electrolyte lithium salts, necessary additives and other raw materials under certain conditions and in a certain proportion. [0003] The composition and concentration of the electrolyte have a great influence on the performance of the battery, especially the charge and discharge performance of the carbon negative electrode material has a great relationship with the solvent in the solution. If...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/42
CPCH01M10/0567H01M10/4235Y02E60/10
Inventor 孙琦张姝尹元王赛赛孙慧英
Owner QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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